MC9S12VR-Family - Data Sheet - Freescale Semiconductor

S12 Clock, Reset and Power Management Unit (S12CPMU_UHV)
Figure 4-17. Voltage Access Select
Table 4-15. CPMUHTCTL Field Descriptions
Field Description
5
VSEL
3
HTE
2
HTDS
1
HTIE
0
HTIF
VBG Ref
C
HTD
VSEL
Voltage Access Select Bit — If set, the bandgap reference voltage V BG can be accessed internally (i.e.
multiplexed to an internal Analog to Digital Converter channel). If not set, the die temperature proportional
voltage V HT of the temperature sensor can be accessed internally.See device level specification for connectivity.
For any of these access the HTE bit must be set.
0 An internal temperature proportional voltage V HT can be accessed internally.
1 Bandgap reference voltage V BG can be accessed internally.
High Temperature Sensor/Bandgap Voltage Enable Bit — This bit enables the high temperature sensor and
bandgap voltage amplifier.
0 The temperature sensor and bandgap voltage amplifier is disabled.
1 The temperature sensor and bandgap voltage amplifier is enabled.
High Temperature Detect Status Bit — This read-only status bit reflects the temperature status.Writes have
no effect.
0 Junction Temperature is below level T HTID or RPM.
1 Junction Temperature is above level T HTIA and FPM.
High Temperature Interrupt Enable Bit
0 Interrupt request is disabled.
1 Interrupt will be requested whenever HTIF is set.
TEMPSENSE
ATD
Channel
High Temperature Interrupt Flag — HTIF — High Temperature Interrupt Flag
HTIF is set to 1 when HTDS status bit changes.This flag can only be cleared by writing a 1.
Writing a 0 has no effect. If enabled (HTIE=1), HTIF causes an interrupt request.
0 No change in HTDS bit.
1 HTDS bit has changed.
MC9S12VR Family Reference Manual, Rev. 2.8
146 Freescale Semiconductor